Size-Specific Dose Estimate Size-Specific Dose Estimate is only for examinations that encompass the chest, abdomen, pelvis, or combination thereof. Enter CTDI mGy Phantom used 16 cm diameter 32 cm diameter Pick size metric and enter diameters Effective diameter √ (AP * lat) AP diameter Lateral diameter Lateral+AP diameter AP cm   Lateral cm Calculate Please input numeric values for CTDI Size-Specific Dose Estimate mGy